Ahsan Ragib, Mitra Avijit, Omar Saleh, Rahman Khan Md Ziaur, Basith M A
Department of Electrical and Electronic Engineering, Bangladesh University of Engineering and Technology Dhaka-1205 Bangladesh.
Department of Physics, Bangladesh University of Engineering and Technology Dhaka-1000 Bangladesh
RSC Adv. 2018 Apr 17;8(26):14258-14267. doi: 10.1039/c8ra01585f.
DyCrO and 10% Fe-doped DyCrO nanoparticles have been synthesized using a sol-gel method to investigate their performance in photocatalytic hydrogen production from water. The synthesized nanoparticles have been characterized by performing X-ray diffraction, energy dispersive X-ray spectroscopy and UV-visible spectrophotometric measurements. In addition, field emission scanning electron microscopy has been performed to observe their size and shape. The Fe-doped DyCrO nanoparticles show a significantly smaller band gap of 2.45 eV compared to the band gap of 2.82 eV shown by the DyCrO nanoparticles. The Fe-doped DyCrO nanoparticles show better photocatalytic activity in the degradation of rhodamine B (RhB) compared to the photocatalytic activity shown by both the DyCrO and Degussa P25 titania nanoparticles. The recycling and reuse of Fe-doped DyCrO four times for the photo-degradation of RhB shows that Fe-doped DyCrO is a stable and reusable photocatalyst. To evaluate the extent of the photocatalytic hydrogen production ability of the synthesized nanoparticles, a theoretical model has been developed to determine their "absorptance", a measure of the ability to absorb photons. Finally, 10% Fe-doped DyCrO proves itself to be an efficient photocatalyst as it demonstrated three times greater hydrogen production than Degussa P25.
采用溶胶-凝胶法合成了DyCrO和10%铁掺杂的DyCrO纳米颗粒，以研究它们在光催化水制氢中的性能。通过X射线衍射、能量色散X射线光谱和紫外-可见分光光度测量对合成的纳米颗粒进行了表征。此外，还进行了场发射扫描电子显微镜观察其尺寸和形状。与DyCrO纳米颗粒2.82 eV的带隙相比，铁掺杂的DyCrO纳米颗粒的带隙显著更小，为2.45 eV。与DyCrO和德固赛P25二氧化钛纳米颗粒的光催化活性相比，铁掺杂的DyCrO纳米颗粒在罗丹明B（RhB）降解中表现出更好的光催化活性。铁掺杂的DyCrO用于RhB光降解的四次循环利用表明，铁掺杂的DyCrO是一种稳定且可重复使用的光催化剂。为了评估合成纳米颗粒的光催化产氢能力，开发了一个理论模型来确定它们的“吸收率”，这是一种吸收光子能力的度量。最后，10%铁掺杂的DyCrO证明自己是一种高效的光催化剂，因为它的产氢量比德固赛P25高三倍。
